[Heathkit] RE: SB-200

[Greg Mijal]

Svetlana fixed that problem in their 811A's.
Too many 30L1 owners going ballistic I guess.
No idea what the Chinese are up to but I assume they read the papers.
73's
Greg
WA7LYO
in sunny Feenix
----- Original Message ----- 
From: "Glen Zook" <gzook at yahoo.com>
To: "Peter Markavage" <manualman at juno.com>; <heathkit at mailman.qth.net>
Sent: Wednesday, July 26, 2006 4:39 PM
Subject: Re: [Heathkit] RE: SB-200


> Both the Chinese 572B and the 811A tubes used to
> suffer (may still suffer) from this.  The problem was
> that the elements were not always aligned in the same
> position as were the Taylor and other "NOS"
> manufacturers tubes.  When they got hot the grid would
> "sag" and short out to the plate.
> 
> Glen, K9STH
> 
> --- Peter Markavage <manualman at juno.com> wrote:
> 
> Wasn't there some issue with using the Chinese 572B's
> in the horizontal position rather than in the vertical
> position as is in most amplifiers? Something to do
> with possible element sag under high heat/high current
> conditions or am I dreaming.
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Glen, K9STH
> 
> Website:  http://k9sth.com
> 
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